Outstanding work (11)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
masterpiece
'outstanding work' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for masterpiece that I've seen before include "Work of outstanding artistry" , "Outstanding work of art" , "outstanding achievement" , "tour de force" , "Work of extreme skill" .)